Add a block to product page by custom module without editing magento default template - magento-1.9

Question

I am trying to add a block to product page by using my custom module.
I do not want to modify any magento default files for this. I know it's possible by modifying the code in view.phtml template. Below is what I tried so far. I have copied the default magento view.phtml file in all module template folder as below. I included layout file inside config.xml of my module and written code for the block.
view.phtml file I placed under each template of module folder.
app/desifn/frontend/default/default/template/mymodule/view.phtml
config.xml file of module -
<frontend>
<routers>
<modulename>
<use>standard</use>
<args>
<module>Module_name</module>
<frontName>modulefrontname</ntNafrome>
</args>
</modulename>
</routers>
<layout>
<updates>
<modulename module="module_name">
<file>module.xml</file>
</modulename>
</updates>
</layout>
</frontend>
This file is under -
app/desifn/frontend/default/default/layout/modulename.xml
<reference name="product.info">
<block type="module_name/product_view" name="product_list">
<action method="setTemplate" ifconfig="module_name/sp_category/status">
<template>modulename/product/view.phtml</template>
</action>
</block>
</reference>

Answer 1

Node modulename is invalid (wrong closing tag)
<updates>
<modulename module="module_name">
<file>module.xml</file>
</module>
</updates>
and also template paths do not match
/mymodule/view.phtml
and
modulename/product/view.phtml
But back to your initial Question:
view.phtml of default template does not contain getChildHtml without any parameters. So the only way to inject custom stuff is to use a block of type core/text_list, which is "product.info.simple.extra". All you need is to make use of before or after attributes in your xml layout.